What is the key factor that makes implants susceptible to infection post-placement?

The susceptibility of dental implants to infection post-placement is primarily influenced by the oral environment's natural flora. The mouth is home to a wide variety of bacteria, some of which can be harmful. When an implant is placed, it creates an interface between the implant material and the surrounding tissues where these bacteria can thrive.

This natural flora plays a crucial role because it can lead to biofilm formation on the implant surface, which is a significant factor in peri-implantitis—a condition marked by inflammation and infection of the tissues surrounding the implant. The presence of specific bacterial species can disrupt the healing process and can lead to complications, including implant failure.

While the length of the implant, type of abutment, and surface texture of the implant can also influence the overall success and stability of the implant, they do not directly address the microbial aspect that is central to infection risk in the context of its surrounding environment. The oral flora's dynamic nature and the potential for pathogenic species make it a key factor in the infection risk associated with dental implants.